Page 73 - Agriculture Form Two

Agriculture for Secondary Schools

FOR ONLINE READING ONLY

Figure 4.6: (a) Adult flea beetle Figure 4.6 (b) sweet potato affected
with a larva of flea beetle

Sources: https://extension.usu.edu/vegetableguide/ Sources: https://www.ipmimages.org/
potato/flea-beetles browse/detail.cfm?imgnum=5605714

(b) Viral diseases

Sweet potatoes are affected by viral diseases such as Sweet potato mild mottle
virus (SPMMV) (Figure 4.7 (a)) and Sweet potato feathery mottle virus (SPFMV)
(Figure 4.7 (b). These diseases are mainly transmitted from infected to uninfected
plants through vectors and planting materials.

Figure 4.7 (a): Sweet potato mild Figure 4.7 (b): Sweet potato feathery
mottle virus symptoms
mottle virus symptoms
on leaves
on leaves

Source: https://www.cabidigitallibrary.org/doi/abs/10.1079/cabicompendium.51028

Student’s Book Form Two 65

04/10/2024 18:07
Agriculture form 2.indd 65
Agriculture form 2.indd 65 04/10/2024 18:07